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Information on Business Segments (Identifiable Intangibles and Goodwill by Segment) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Segment Reporting Information [Line Items] |  |  |
Assets Including Allocation of Identifiable Intangible Assets and Goodwill |  | $ 3,048.7 | $ 2,788.6
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets Including Allocation of Identifiable Intangible Assets and Goodwill |  | 2,743.6 | 2,522.7
Unallocated Assets |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets Including Allocation of Identifiable Intangible Assets and Goodwill |  | 303.8 | 265.0
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets Including Allocation of Identifiable Intangible Assets and Goodwill | [1] | 1.3 | 0.9
ACCO Brands North America | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets Including Allocation of Identifiable Intangible Assets and Goodwill | [1] | 1,476.3 | 1,165.1
ACCO Brands EMEA | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets Including Allocation of Identifiable Intangible Assets and Goodwill | [1] | 710.4 | 670.9
ACCO Brands International | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets Including Allocation of Identifiable Intangible Assets and Goodwill | [1] | $ 556.9 | $ 686.7
[1] | Represents total assets, excluding intercompany balances, cash, deferred taxes, derivatives, prepaid pension assets, prepaid debt issuance costs and right of use asset, leases.

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